Potassium hydrogen phthalate solution, 500 ml
Boiling point (bp) 100 °C
Melting point (mp) 0 °C
ADR 8 III
excl. VAT. | 500 ml per Pack Qty.
Art. No. 2055.2
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Determination of chemical oxygen demand (COD)
COD (chemical oxygen demand) is a measure of all the oxidisable components in water under specific conditions. The water sample is mixed with sulphuric acid and heated together with a defined quantity of potassium dichromate, with silver sulphate added as the catalyst. Chloride must be removed beforehand or masked with mercury sulphate. The remaining potassium dichromate is measured by means of titration, using an ammonium iron(II) sulphate solution and ferroin as the indicator. The equivalent amount of oxygen can then be calculated from the amount of potassium dichromate that is used up.